Added support for ccache and distcc.

SConstruct

@@ -77,6 +77,8 @@ opts.AddOptions(
     ('boost_suffix', 'Suffix of boost libraries.'),
     PathOption('gettextdir', 'Root directory of Gettext\'s installation.', "", OptionalPath), 
     ('host', 'Cross-compile host.', ''),
+    BoolOption('distcc', "Use distcc", False),
+    BoolOption('ccache', "Use ccache", False),
     ('cxxtool', 'Set c++ compiler command if not using standard compiler.'),
     BoolOption("fast", "Make scons faster at cost of less precise dependency tracking.", False)
     )
@@ -101,6 +103,10 @@ if env.get('cxxtool',""):
 	env['CXX'] = env['cxxtool']
 	env['ENV']['HOME'] = os.environ['HOME']
 
+if env['distcc']: env.Tool('distcc')
+if env['ccache']: env.Tool('ccache')
+
+
 Help("""Arguments may be a mixture of switches and targets an any order.
 Switches apply to the entire build regrdless of where they are in the order.
 Important switches include:
@@ -150,7 +156,7 @@ If you set CXXFLAGS and/or LDFLAGS in the environment, the values will
 be appended to the appropriate variables within scons.
 """ + opts.GenerateHelpText(env))
 
-if env["cachedir"]:
+if env["cachedir"] and not env['ccache']:
     CacheDir(env["cachedir"])
 
 if env["fast"]:

scons/ccache.py

@@ -0,0 +1,32 @@
+# vi: syntax=python:et:ts=4
+# Shamelessly stolen from FreeOrion's SConstruct
+# http://freeorion.svn.sourceforge.net/viewvc/freeorion/trunk/FreeOrion/SConstruct?revision=2478&view=markup
+
+import os
+
+def exists():
+    return True
+
+def generate(env):
+        env['CC'] = 'ccache %s' % env['CC']
+        env['CXX'] = 'ccache %s' % env['CXX']
+        for i in ['HOME',
+                  'CCACHE_DIR',
+                  'CCACHE_TEMPDIR',
+                  'CCACHE_LOGFILE',
+                  'CCACHE_PATH',
+                  'CCACHE_CC',
+                  'CCACHE_PREFIX',
+                  'CCACHE_DISABLE',
+                  'CCACHE_READONLY',
+                  'CCACHE_CPP2',
+                  'CCACHE_NOSTATS',
+                  'CCACHE_NLEVELS',
+                  'CCACHE_HARDLINK',
+                  'CCACHE_RECACHE',
+                  'CCACHE_UMASK',
+                  'CCACHE_HASHDIR',
+                  'CCACHE_UNIFY',
+                  'CCACHE_EXTENSION']:
+            if os.environ.has_key(i) and not env.has_key(i):
+                env['ENV'][i] = os.environ[i]

scons/distcc.py

@@ -0,0 +1,24 @@
+# vi: syntax=python:et:ts=4
+# Shamelessly stolen from FreeOrion's SConstruct
+# http://freeorion.svn.sourceforge.net/viewvc/freeorion/trunk/FreeOrion/SConstruct?revision=2478&view=markup
+
+import os
+
+def exists():
+    return True
+
+def generate(env):
+        env['CC'] = 'distcc %s' % env['CC']
+        env['CXX'] = 'distcc %s' % env['CXX']
+        for i in ['HOME',
+                  'DISTCC_HOSTS',
+                  'DISTCC_VERBOSE',
+                  'DISTCC_LOG',
+                  'DISTCC_FALLBACK',
+                  'DISTCC_MMAP',
+                  'DISTCC_SAVE_TEMPS',
+                  'DISTCC_TCP_CORK',
+                  'DISTCC_SSH'
+                  ]:
+            if os.environ.has_key(i) and not env.has_key(i):
+                env['ENV'][i] = os.environ[i]